Diestock



Feb. 2,1926. 1,571,515

R. C. FLEMING DIESTOCK Filed August 26 1925 L O O gmaenl'or 71. fizz/105g Patented Feb. 2, 1926.

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RICHARD C. FLEMING, OF DETROIT, MICHIGAN.

DIESTOCK.

Application filed August 26, 1925. Serial No. 52,596.

' employing the ordinary guide bushings such as surrounds the exterior of the pipe during the threading operation.

More specifically, I propose the provision of a stock which includes a hub in which the guide is mounted for rotation and sliding, there being separate coiled springs associated with this guide, removable die rings and retaining plates therefor.

Other structural features and advantages derived from their use will become apparent from the following description and drawing.

In the accompanying drawing forming a part of this specification and in which like numerals are employed to designate like parts throughout the same 2- Figure 1 is a view in section and elevation of a die stock as constructed in accordance with the present invention.

Figure 2 is a. detail view of one of the removable die holders or cover plates.

Referring to the drawing in detail, the reference character 1 designates the body or hub portion of the stock and 2 indicates the handle. The portion 1 is bored centrally and is then counter-bored at its outer ends. The die cutters are fitted into these counter-bores, these die cutters being represented by the reference character 3. These dies are held in place by removable cover plates 4 which are in turn secured to the hub 1 by bolts 5. The plates 4: are formed with central openings around the pipe sections 6 which are adapted to be threaded. One of the plates is shown more plainly in Fig. 2 and by referring to this figure, it will be seen that the same is substantially rectangular in general outline and that the central opening is surrounded with circnmfen entially spaced notches. These notches afford openings which the metallic out-tings pass through during the threading operatlon.

By placing the cutting dies in the counterbores, a substantially cylindrical chamber is formed between the same. It is in this chamber that the major portions of the improved guide members are confined. The guide member comprises a central disk 7 and axial extensions 8 and 9 respectively. The

extension 8 is of one diameter and the extension 9 is of a greater diameter thus adapting them for reception in pipe sections having different internal diameters. The guide member is maintained in the central position shown by coiled springs 10 of substantially equal tension. This allows the extensions 8 and 9 to project beyond the stock to facilitate insertion into a pipe.

In the arrangement shown and described, the appropriate one of the guide extensions 8 or 9 is inserted into the pipe to be threaded. This is determined by theinternal diameter of the particular pipe section to be acted on. With the guide extension fitting lnto the pipe as represented in Figure 1, the cutting dies are engaged with the pipe in the usual way and the stock is rotated to form threads on the pipe. It will be noted that the guide member is a substantially independent member and may slide or turn with respect to the stock.

It is believed that by carefully considering the description in connection with the drawing, persons familiar with tools of this kind will be able to attain clear understanding of the invention. Moreover such a consideration will undoubtedly bring out the advantages derived from this improved structure. Consequently a more lengthy description is thought unnecessary.

WVhile the preferred embodiment of the invention has been shown and described it is to be understood that minor changes coming within the field of invention claimed may be resorted to as desired.

I claim In a structure of the class described, a die stock embodying a central bored hub having handles, said bore being enlarged at its outer end to provide counter-bores cutting dies fitted in said counter-bores, retaining plates for said. dies connected with said hub, a guide member having its central portion located in said bore and including {11X- ially aligned cylindrical guide extensions projecting through and beyond said counterbores, and springs surrounding said extensions and bearing at their inner ends against the central portion of the guide member and at their outer ends against said dies.

In testimony whereof I afliix my signature.

RICHARD C. FLEMING. 

